FLUE PASSAGEWAY AND FLUE BOX
The flue passages and flue box should be inspected and
cleaned prior to each heating season. The sequence of
operation should be as follows:
1 - Turn off both electrical and gas supply to unit.
2 - Disconnect combustion air inducer wiring.
3 - Remove combustion air inducer assembly. Remove
flue box. If necessary, remove inducer assembly
from flue box. Clean flue box with wire brush.
4 - Remove burners as described in "Burners" section.
5 - Clean tubes with a wire brush.
6 - Reassemble unit. The combustion air and flue box
gaskets should also be replaced during reassembly.
7 - Restore electrical power and gas supply. Follow
lighting instructions to light unit. Check operation of
unit.
COMBUSTION AIR INDUCER
Under normal operating conditions, the combustion air in-
ducer should be checked and cleaned prior to the heating
season with the power supply disconnected. Use a small
brush to clean inducer wheel.
ELECTRICAL
1 - Check all wiring for loose connections.
2 - Check for correct voltage at unit (unit operating).
3 - Check amperage draw.
FLUE AND CHIMNEY
Check all vent and vent connector joints for tightness. En-
sure that connections are sealed and that there are no
blockages.
When ordering repair parts, include the complete unit model number listed on the unit rating plate. For exam-
ple: LS25-125A-1. Contact the installing dealer, or visit www.lennox.com or call 1-800-9LENNOX for a list of
the Lennox dealers in the area. Include manufacturer's or distributor's name and address. It is a requirement
in the Z83.8 standard.
Job Name:
Job Location:
Installer:
Unit Model No.:
Electrical Connections Tight?
Supply Voltage
Blower Motor Lubrication O.K.?
Gas Piping Connections Tight & Leak-Tested?
Blower Motor Amps
Furnace Btu Input
Line Pressure
Manifold Pressure
REPAIR PARTS
START-UP AND PERFORMANCE CHECKLIST
Job No.:
City:
City:
Serial No.:
w.c.
FAILURE TO OPERATE
If unit fails to operate check the following:
1 - Is thermostat calling for heat?
2 - Is main disconnect closed?
3 - Is there a breaker tripped or a fuse blown?
4 - Is gas turned on at meter?
5 - Is manual shutoff valve open?
6 - Is unit ignition system in lock out? If unit locks out
again, call service technician to inspect unit.
7 - Is pressure switch closed? Obstructed flue will
cause unit to shut off at pressure switch. Check flue
passage and outlet.
SAFETY SHUT-OFF VALVE TEST
The safety shut-off valve test procedure is as follows:
1 - Turn off the manual gas valve.
2 - Set the thermostat to call for heat.
3 - System begins normal sequence of operation.
4 - After approximately 30 seconds (pre purge period)
the LED will fast flash indicating the gas valve is
powered.
5 - After 10 seconds, the gas valve closes and steps 4
and 5 will repeat two additional times before locking
out the gas valve, which will be indicated by two
flashes on the LED.
6 - To restart the system, de-energize the thermostat call
for heat and follow the operating instructions under
"Unit Start-Up and Operation."
Date:
State/Province:
State/Province:
Service Technician:
Air Shutters Properly Adjusted (If Installed)?
Flue Connections Tight?
Fan Timer Operation Checked?
THERMOSTAT
Calibrated?
Heat Anticipator Properly Set?
Level?
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